SU1483277A1 - Method of metering piece ferromagnetic materials - Google Patents

Abstract

The invention can be used to dispense lumpy ferromagnetic materials using an adjustable electromagnetic sectional gripper. The invention makes it possible to increase the measurement accuracy due to the fact that the set of material is carried out in an amount of at least a predetermined dose by a combination of gripper sections in accordance with the load carrying capacity likely for the given material. Then the material collected by the gripper is weighed, the deviation of the actual dose from the set value is determined, and excess material is dropped from the included gripper section, the load carrying capacity of which is closest to the deviation, reducing the current in this section. 1 il.

Description

The invention relates to weighing technology and can be used in the foundry industry and ferrous metallurgy, mainly in the dosing and feed systems of the charge in the smelting units.

The purpose of the invention is to improve the measurement accuracy.

The essence of the method is to search for the combination of included gripper sections necessary for a given dose in accordance with the capacity of each of these materials, and after calculating the deviation of the actual dose from the given value, choose the section from which it is included. close to the magnitude of the deviation, and reducing the current in this section discharges excess material.

The drawing shows a block diagram of a device for carrying out the proposed method.

The device contains sets of 1-4 probable load-carrying sections, switches 5-8, adder 9, amplifiers 10 and 11, unit 12 setting doses, mass sensor 13, indicators 14 and 15, switches 16-19, keys 20-23, control units 24-27, switches 28-35, sections 36-39 of the electromagnetic tong, and comparison elements 40-42.

The method is carried out as follows.

In the initial state, all switches are open and sections of the electromagnetic gripper are de-energized. The operator through the switches 5-8 connects to the input of the adder 9 such a combination of the output signals of the setting devices 1-4, which will satisfy the inequality.

D U n D U Oh,

where d1 / s Ј U ,, - U3;

Od - a signal proportional to the mass of the dose;

Ј

oo

00

u 1 1

 actually typed by the tong

Ug, is the output signal of the block for setting the maximum load capacity of the 1st section of the gripper;

D Uui - the threshold value of D U .; gp - the number of sections included

gripper.

The value of D U is determined by the operator by indicator 14.

In the event that a given dose mass is greater than the total gripper loading capacity, the dose is set in several cycles, and the choice of the optimal combination of the included gripper sections is made

and

in the last cycle, when U3 ZlU.

vi In the remaining cycles include all sections.

After determining the required combination of the included gripper sections, the operator switches them on via switches 16-19. The power is then supplied to the corresponding keys 20-23 and the corresponding sections 36--39 of the gripper are turned on. The operator then lowers the gripper onto the ferromagnetic material, the material is gripped by the included sections, after which the gripper is lifted to a predetermined height. Weight

The material is sensed by the mass sensor 13, the UV output of which is compared in the comparison element 41 with the output signal Us of the dose setting unit 12. At the output of the comparison element 41, a signal D is implied, proportional to the deviation of the actual dose from the predetermined value. This signal is provided to reference element 42. Then, the operator, using switches 28-31, connects to the second input of the comparator element 42 an output signal Uc, that of the included setters 1-4, in which the inequality is observed

L uu. D,

where D Uui is the threshold value D U.

As a result, that gripper section was found out of the combination included, with a load carrying capacity that is closest to the deviation of the actual dose from the given one. The operator determines

The mask D U is on indicator 15 and disconnects U "by one of the switches 28-31 from the comparison element 42. In this case, D Uc D UV. In case D UV is O, the dose is ready. When the operator using one of the switches 32-35 turns on the regulating unit of the previously selected gripper section and reduces the current in this section until the moment when D UV 1 0.

By controlling the current of one preselected section (from among those included), the load capacity of which is closest to the deviation of D UV is likely, the probability of discharge from this section of the amount of material corresponding to L UV increases significantly, which reduces the metering error in each cycle. This completes the dosing process.

When recruiting the following doses of this material, the selected combination of the gripper sections included remains unchanged, and the operator determines in each dosing cycle only the section from which the excess material should be discharged.

When the dose value is changed, the combination of the included grip sections must be changed in accordance with their likely carrying capacity for this material.

Claims (1)

Invention Formula The method of dosing lumpy ferromagnetic materials, which consists in picking up a material with a sectional electromagnetic gripper of adjustable carrying capacity, weighs it, determines the deviation of the actual dose from the set and resets the excess material, characterized in that, in order to improve accuracy, quantity of at least a given dose of a combination of gripper sections in accordance with the carrying capacity of each of them, and the excess material has been dumped Of the included gripper section, the load carrying capacity of which is closest to the deflection is likely, reducing the current in this section. I